Emergency auto-on lights that plug into the wall socket are a good idea. The only problem I've had with those are the cheap rechargeable batteries that the lights come with. In my experience they only last about a year and a half and then don't hold a charge anymore. I have seen another model that I think is a bit better and it uses non-rechargeable alkaline batteries. It also plugs into the wall socket and turns on in a power outage.